Exterior wall member and construction

ABSTRACT

Described herein is an exterior wall member capable of reducing cooling and heating energy consumption by reducing influent and effluent heat amounts between indoor and outdoor environments in such a situation that the indoor temperature is kept constant by use of cooling and heating equipment independently of the outdoor air temperature changes, and to provide a construction including the exterior wall member. The disclosed exterior wall member includes an outdoor-side heat insulating layer (A); an indoor-side heat insulating layer (B); and a heat storage layer between the outdoor-side heat insulating layer (A) and the indoor-side heat insulating layer (B).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a US non-provisional application, which claims thebenefit of priority to Japanese Patent Application No. 2019-003257,filed Jan. 11, 2019, the content of which is incorporated herein byreference in its entirety.

BACKGROUND OF THE INVENTION Field of the Invention

The present disclosure relates to an exterior wall member, and aconstruction including the exterior wall member.

Description of the Related Art

Constructions have been improved to have greater heat insulatingproperties in order to facilitate both indoor comfortability and energysaving for cooling and heating. However, there has been such a problemthat exterior walls become too thick when the exterior walls attainsufficient heat insulating properties only by including a heatinsulating material. To address this problem, recently proposed are suchexterior walls that include a heat insulating material and a latent heatstorage material in combination, thereby making it possible to utilizetemperature differences between daytime and nighttime for lesseningtemperature changes in indoor environment or the like, thereby attaininggreater energy saving properties.

For example, “AIJ Journal of Technology and Design”, vol. 22, No. 52,1027-1030 discloses that the indoor temperature change is smaller in aroom surrounded with exterior walls including a combination of a latentheat storage material layer and a heat insulating material provided onan outdoor side with respect to the latent heat storage material layerwhile not including a heat insulating material on an indoor side withrespect to the latent heat storage material layer, compared with a roomsurrounded with exterior walls including a heat insulating material butnot a latent heat storage material layer.

Furthermore, Patent Literature 1 discloses an exterior wall including acombination of a heat insulating material positioned on an outdoor sideand a heat storage material positioned on an indoor side. JP-A-61-122354describes that, for reducing indoor temperature increases during daytimewith the heat storage material, it is important that the heat storagematerial be located on the indoor side, and a heat insulating materialshould not be provided on the indoor side with respect to the heatstorage material.

Any of these techniques described in the Patent and Non-PatentLiteratures mentioned above aim to improve the energy saving property byproviding the heat storage material on the indoor side with respect tothe heat insulating material.

Furthermore, JP-A-9-174741 discloses a heat insulating panel including aheat storage layer and heat insulating layers respectively provided onboth indoor and outdoor sides of the heat storage layer in order toalleviate bedewing within the heat insulating panel.

PRIOR ART DOCUMENT Patent Document

-   [Patent Document 1] Japanese Unexamined Patent Application    Publication No. 61-122354 (published on Jun. 10, 1986)-   [Patent Document 2] Japanese Unexamined Patent Application    Publication No. 09-174741 (published on Jul. 8, 1997)

Non-Patent Document

-   [Non-Patent Document 1] AIJ Journal of Technology and Design Vol.    22, No. 52, 1027-1030 (published on October, 2016)

SUMMARY OF THE INVENTION

Recently, there has been a demand for an exterior wall member forimproving energy saving property in such a situation that indoortemperature is continuously kept constant by use of cooling and heatingequipment.

While the exterior walls described in the Patent and Non-PatentLiteratures mentioned above are effective in reducing the indoortemperature changes caused in association with outdoor air temperaturechanges, the Patent and Non-Patent Literatures are silent as to whetheror not the exterior walls, which function only in a temperature-changingenvironment, are effective in energy saving in such a situation that theindoor temperature is continuously kept constant by use of the coolingand heating equipment.

Furthermore, these Patent and Non-Patent Literatures are silent in that,under such a situation that the indoor temperature is kept constant byuse of the cooling and heating equipment independently of the outdoorair temperature that changes between daytime and nighttime and from dayto day, heat storage materials should have what kind of latent heatstorage property in order to reduce influent and effluent heat amountsbetween indoor and outdoor environments thereby to reduce cooling andheating energy consumption.

In view of these, the present inventors found that these problems can besolved by configuring an exterior wall member to include a heat storagelayer and heat insulating layers respectively on each of indoor andoutdoor sides of the heat storage layer in such a manner that the heatstorage layer is positioned at a certain position in the exterior wallmember and is a heat storage layer having a specific latent heat storageproperty.

An object of the present disclosure is to provide an exterior wallmember capable of reducing cooling and heating energy consumption byreducing influent and effluent heat amounts between indoor and outdoorenvironments in such a situation that the indoor temperature is keptconstant by use of cooling and heating equipment independently of theoutdoor air temperature changes, and to provide a construction includingthe exterior wall member.

The present invention provides the followings.

[1] An exterior wall member, including:

an outdoor-side heat insulating layer (A);

an indoor-side heat insulating layer (B); and

a heat storage layer between the outdoor-side heat insulating layer (A)and the indoor-side heat insulating layer (B), in which

R≤0.20 where R is represented by Equation (3):R=2(R1−0.5)²+(R2−1)²+(R3−0.55)²  (3),where R1 is represented by Equation (1):R1=(Tb/Kb)/(Ta/Ka+Tb/Kb)  (1),

where Ka is a thermal conductivity of the outdoor-side heat insulatinglayer (A), Ta is a thickness of the outdoor-side heat insulating layer(A), Kb is a thermal conductivity of the indoor-side heat insulatinglayer (B), and Tb is a thickness of the indoor-side heat insulatinglayer (B),

R2 is a ratio of a latent heat amount of the heat storage layer in atemperature range of 15° C. to 40° C. with respect to a latent heatamount of the heat storage layer in a temperature range of −10° C. to60° C., and

R3 is represented by Equation (2):R3=L5/L20  (2),

where L5 is a latent heat amount of the heat storage layer in atemperature range X, and

L20 is a latent heat amount of the heat storage layer in a temperaturerange of (X′−10)° C. inclusive to (X′+10)° C. inclusive,

X is a 5° C.-width temperature range in which the latent heat amount ofthe heat storage layer is the largest among latent heat amounts of given5° C.-width temperature ranges within the temperature range of −10° C.to 60° C., and

X′ is a center temperature of the temperature range X.

[2] The exterior wall member according to [1], in which R1 is not lessthan 0.30 but not more than 0.70, R2 is not less than 0.70 but not morethan 1.00, and R3 is not less than 0.30 but not more than 0.80.

[3] The exterior wall member according to [1] or [2], in which at leastone layer selected from the group consisting of the outdoor-side heatinsulating layer (A) and the indoor-side heat insulating layer (B) is alayer comprising a polystyrene foam, a rigid polyurethane foam or aphenol resin foam having a thermal conductivity of 0.03 W/(m·K) or less.[4] The exterior wall member according to any one of [1] to [3], inwhich X′ is not less than 15° C. but not more than 40° C.[5] The exterior wall member according to any one of [1] to [4], inwhich the heat storage layer has a moisture permeability resistance of900 m²h·mmHg/g or less.[6] A construction including:

the exterior wall member according to any one of [1] to [5], in which

the outdoor-side heat insulating layer (A) included in the exterior wallmember is disposed on an outdoor side of the construction and theindoor-side heat insulating layer (B) is disposed on an indoor side ofthe construction.

[7] Use of the exterior wall member according to any one of [1] to [5]as an exterior wall.

With the exterior wall member according to the present disclosure, insuch a situation that indoor temperature is continuously kept constantby use of cooling and heating equipment, it is possible to facilitatereduction of influent and effluent heat amounts between indoor andoutdoor environment independently of various outdoor air temperaturechanges, thereby making it possible to attain a construction achievingboth of indoor comfortability and high energy saving effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a vertical cross-sectional view of one embodiment of anexterior wall member according to the present disclosure;

FIG. 2 is a vertical cross-sectional view illustrating sizes of oneembodiment of the exterior wall member according to the presentdisclosure;

FIG. 3 is a view illustrating temperature distributions of apparentspecific heat of heat storage materials 1 to 4 used in Examples;

FIG. 4 is a view illustrating temperature distributions of latent heatin the heat storage materials 1 to 4 used in Examples;

FIG. 5 is a view illustrating temperature distributions of apparentspecific heat of heat storage materials 5 to 8 used in Examples;

FIG. 6 is a view illustrating temperature distributions of latent heatin the heat storage materials 5 to 8 used in Examples;

FIG. 7 is a view illustrating an outdoor-side surface temperature insimulation;

FIG. 8 is a view illustrating overall properties of Examples 1 to 8 andComparative Examples 1 to 24;

FIG. 9 is a view illustrating temperature conditions of Example 9 andComparative Example 25; and

FIG. 10 is a view illustrating experimental results of Example 9 andComparative Example 25.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of an exterior wall member according to the presentdisclosure are described below, referring to the drawings. FIG. 1 is aview illustrating an exterior wall member 1, which is one embodiment ofthe exterior wall member according to the present disclosure. Note thatthe upper side of the drawings is an outdoor side and the lower side ofthe drawings is an indoor side.

The exterior wall member according to the present disclosure includes anoutdoor-side heat insulating layer (A) and an indoor-side heatinsulating layer (B), and a heat storage layer between the outdoor-sideheat insulating layer (A) and the indoor-side heat insulating layer (B),in which:

R≤0.20 where R is represented by Equation (3):R=2(R1−0.5)²+(R2−1)²+(R3−0.55)²  (3).

R1, R2, and R3 are described below. The exterior wall member accordingto the present disclosure is prepared with an outdoor-side heatinsulating layer (A) having a selected thermal conductivity andthickness, an indoor-side heat insulating layer (B) having a selectedthermal conductivity and thickness, and the heat storage layer preparedfrom a selected material, in order that R may be not more than 0.20.

<R1>

R1 is represented by Equation (1).R1=(Tb/Kb)/(Ta/Ka+Tb/Kb)  (1)where Ka is a thermal conductivity of the outdoor-side heat insulatinglayer (A), Ta is a thickness of the outdoor-side heat insulating layer(A), Kb is a thermal conductivity of the indoor-side heat insulatinglayer (B), and Tb is a thickness of the indoor-side heat insulatinglayer (B).

R1 is adjustable by changing the thermal conductivity or thickness ofthe outdoor-side heat insulating layer (A), or the thermal conductivityor thickness of the indoor-side heat insulating layer (B).

R1 is preferably in a range of 0.30 to 0.70, and further preferably in arange of 0.35 to 0.65.

Thickness Ta of the outdoor-side heat insulating layer (A) is forexample in a range of 10 mm to 80 mm, and further preferably in a rangeof 50 mm to 80 mm.

Thickness Tb of the indoor-side heat insulating layer (B) is for examplein a range of 10 mm to 80 mm, and further preferably in a range of 50 mmto 80 mm.

The heat conductivities of the outdoor-side heat insulating layer (A)and the indoor-side heat insulating layer (B) are described below.

<R2>

R2 is a ratio of a latent heat amount of the heat storage layer in atemperature range of 15° C. to 40° C. with respect to a latent heatamount of the heat storage layer in a temperature range of −10° C. to60° C.

R2 is preferably in a range of 0.70 to 1.00, and further preferably in arange of 0.75 to 1.00.

In this Specification, the latent heat amount is a value measuredaccording to JSTM 06101:2018 (which is the standard of Japan TestingCenter for Construction Materials) in the following manner.

A test piece is held between two flat hot plates whose temperature canbe increased or decreased at a constant rate. (1) The hot plates arekept at 60° C. for 5 hours, then (2) cooled from 60° C. to −10° C. at arate of 0.1° C./min, then (3) kept at −10° C. for 5 hours, and then (4)heated from −10° C. to 60° C. at a rate of 0.1° C./min. Latent heatamounts at these temperatures are worked out from a heat flow measuredby a heat flow meter at Step (4).

In this Specification, specific heat means a value indicating a heatamount necessary to increase temperature of a material by 1K per unitmass of the material. Apparent specific heat means a value attained byadding a latent heat amount to the specific heat. The latent heat amountmeans a heat amount absorbed or released by solid-liquid phasetransition. In this Specification, the latent heat amount is fusionenthalpy (ΔH) observed within a specific temperature range.

<R3>

R3 is represented by Equation (2).R3=L5/L20  (2)

where L5 is a latent heat amount of the heat storage layer in atemperature range X, and

L20 is a latent heat amount of the heat storage layer in a temperaturerange of (X′−10)° C. inclusive to (X′+10)° C. inclusive,

X is a 5° C.-width temperature range in which the latent heat amount ofthe heat storage layer is the largest among latent heat amounts of given5° C.-width temperature ranges within the temperature range of −10° C.to 60° C., and X′ is a center temperature of the temperature range X.

The latent heat amount for working out R3 is measured as below.

Latent heat amounts of the heat storage layer within the temperaturerange from −10° C. to 60° C. are measured thereby to measure latent heatamounts at every 1° C. for 5° C.-width temperature ranges, such as −10°C. to −5° C., −9° C. to −4° C., and −8° C. to −3° C. Among the latentheat amounts thus measured, a greatest latent heat amount is referred toas L5, and the 5° C.-width temperature range at which L5 is measured isreferred to as X.

R3 is preferably in a range of 0.30 to 0.80, and further preferably in arange of 0.30 to 0.75.

X′ is preferably not less than 15° C. but not more than 40° C., andfurther preferably not less than 20° C. but not more than 35° C.

R2 and R3 represent latent heat properties of the heat storage layer,respectively. The material of the heat storage layer is selected asappropriate in order that certain R2 and R3 may be attained.

The latent heat layer includes a latent heat storage material asdescribed later. If the latent heat storage material is a low molecularlatent heat storage material,

R2 and R3 can be adjusted by:

1) using a combination of more than two types of low molecular latentheat storage materials having different melting points,

2) using a combination of a low molecular latent heat storage materialand another low molecular compound, or

3) using a combination of a low molecular latent heat storage materialand a high molecular latent heat storage material.

If the latent heat storage material is a high molecular latent heatstorage material, R2 and R3 can be adjusted by selecting types andamounts of structural units in the high molecular latent heat storagematerial.

<Heat Insulating Layer>

In this Specification, the outdoor-side heat insulating layer (A) is aheat insulating layer provided on the outdoor side with respect to theheat storage layer in the exterior wall member according to the presentdisclosure.

In this Specification, the indoor-side heat insulating layer (B) is aheat insulating layer provided on the indoor side with respect to theheat storage layer in the exterior wall member according to the presentdisclosure.

In this Specification, the heat insulating layers are a layer being 0.05W/(m·K) or less in thermal conductivity.

In this Specification, the thermal conductivity is a coefficientindicating easiness of heat transfer, and means a heat amount that wouldbe transferred in unit area in unit time if there is a temperaturedifference of 1K per unit thickness. The thermal conductivity ismeasured according to ASTM E1530 by a heat flow method.

The outdoor-side heat insulating layer (A) and the indoor-side heatinsulating layer (B) are not particularly limited as to materialsconstituting the heat insulating layers (A) and (B), as long as the heatconductivities of the heat insulating layers (A) and (B) are 0.05W/(m·K) or less.

Examples of the materials of the outdoor-side heat insulating layer (A)and the indoor-side heat insulating layer (B) include resin foam.

Examples of the resin foam include polystyrene foam, rigid polyurethanefoam, acrylic resin foam, phenol resin foam, polyethylene resin foam,foam rubber, foam ceramic, and the like.

It is preferable that the thermal conductivity of the outdoor-side heatinsulating layer (A) be 0.03 W/(m·K) or less. It is preferable that thethermal conductivity of the indoor-side heat insulating layer (B) be0.03 W/(m·K) or less.

The heat conductivities of the outdoor-side heat insulating layer (A)and the indoor-side heat insulating layer (B) are independent from eachother. Examples of preferable materials having a low thermalconductivity and used for the heat insulating layers include polystyrenefoam, phenol resin foam, and rigid polyurethane foam. It is preferablethat the outdoor-side heat insulating layer (A) and/or the indoor-sideheat insulating layer (B) be a layer including polystyrene foam, phenolresin foam, or rigid polyurethane foam whose thermal conductivity is0.03 W/(m·K) or less. For the sake of installability, it is preferablethat the outdoor-side heat insulating layer (A) and/or the indoor-sideheat insulating layer (B) be board-shaped foam and pre-fabricated bybeing attached to the heat storage layer.

<Heat Storage Layer>

The heat storage layer is a layer having heat storage property due tolatent heat.

The heat storage layer is preferably a layer having a latent heat amountper area of 15 kJ/m² or more for the temperature range of −10° C. to 60°C. The latent heat amount per area of the heat storage layer for thetemperature range of −10° C. to 60° C. is more preferably 25 kJ/m² ormore, and further preferably 50 kJ/m² or more.

The heat storage layer has a thickness Ths, for example, in a range of0.50 mm to 7.0 mm and preferably in a range of 1.0 mm to 5.0 mm. Asdescribed later, in the case of a configuration including a plurality ofthe heat storage layers, the thickness Ths is sum of the thicknesses ofthe plurality of the heat storage layers.

It is preferable that the heat storage layer have a density of 1500kg/m³ or less, for the sake of reducing weights of the exterior wallmember. The density is measured by a water displacement method, apycnometer method, a sink-float method, or a density-gradient tubemethod (JIS K7112).

It is preferable that the heat storage layer have such a moisturepermeability that a moisture permeability resistance is 900 m²h·mmHg/gor less for the sake of alleviating bedewing. Although the heat storagelayer is not particularly limited in terms of its shape as long as theheat storage layer has such desirable moisture permeability, it ispreferable that the heat storage layer have through holes. Examples ofthe heat storage layer include a heat storage layer prepared with suchthrough holes formed by physically processing a sheet, a heat storagelayer prepared with such through holes formed via foaming when amaterial is foamed to a shape, and a fibrous heat storage layer such asa non-woven cloth. For forming such through holes by physicallyprocessing a sheet, it is possible to form the through holes in thesheet by using a roller with protrusions on producing the sheet, or topost-fabricate the through holes, that is, to form the through holes inthe sheet by using needles, a punching machine, an interstice of theroller with protrusions, or the like after forming the sheet without thethrough holes. The through holes individually have an area preferablynot less than 0.03 mm² but not more than 1.00 mm², and furtherpreferably not less than 0.04 mm² but not more than 0.64 mm². Thethrough holes are distanced from each other with minimum intervalspreferably not less than 1.5 mm but not more than 6.0 mm, and furtherpreferably not less than 2.0 mm but not more than 5.0 mm. It is possibleto achieve a greater effect of alleviating the bedewing by tapering thethrough holes with a wider opening on the indoor side by using a rolleror a punching machine with tapered protrusions. In terms of a taperingangle, the tapered protrusions are preferably angled by not less than45° but not more than 70°, and further preferably by not less than 50°but not more than 65°. Examples of shapes of the tapered protrusionsinclude a quadrangular pyramid, a circular pyramid, and the like.Furthermore, apart from the use of through holes, it is also possible togive the heat storage layer a desirable moisture permeability by makingincisions, slits, or the like in the heat storage layer.

The moisture permeability resistance is measured by a cup methodaccording to JIS A1324.

The heat storage layer includes a latent heat storage material. In thisSpecification, the latent heat storage material is a material thatexhibits latent heat storage due to phase transition (hereinafter,referred to as “heat storage material”). Examples of the latent heatstorage materials include low molecular latent heat storage materialsand high molecular latent heat storage materials.

Examples of the low molecular latent heat storage materials includeorganic low molecular latent heat storage materials and inorganic lowmolecular latent heat storage materials.

Examples of the organic low molecular latent heat storage materialsinclude paraffin, long-chain fatty acids, long-chain alcohols,long-chain fatty acid esters, sugar alcohols, and the like. Thesematerials may be used in such a form that they are sealed in organicmicro capsules, fixed with a gelling agent, or sealed in plastic vesselsor the like.

Examples of the inorganic low molecular latent heat storage materialsinclude inorganic salt hydrates and the like. Examples of the inorganicsalt hydrates include, but not limited to, lithium perchlorate hydrate,sodium hydroxide hydrate, potassium fluoride hydrate, lithium nitratehydrate, calcium chloride hydrate, sodium sulfate hydrate, sodiumcarbonate hydrate, sodium hydrogenphosphate hydrate, sodium zinc nitratehydrate, calcium bromide hydrate, and the like. These are preferablyused in such a form that they are sealed in plastic vessels or the like.

Examples of such high molecular latent heat storage materials includepolymers side-chained with a long-chain alkyl group or a long-chainether group, which may be branched and may be substituted with afunctional group. Examples of the polymers include, but not limited to,polymers whose main constituent is (meth)acrylate, side-chained with along-chain alkyl group or a long-chain ether group, which may bebranched and may be substituted with a functional group, polymers whosemain constituent is a vinyl ester main chain, side-chained with along-chain alkyl group or a long-chain ether group, which may bebranched and may be substituted with a functional group, polymers whosemain constituent is a vinyl ether main chain, side-chained with along-chain alkyl group or a long-chain ether group, which may bebranched and may be substituted with a functional group, and polymerswhose main constituent is a polyolefin main chain, side-chained with along-chain alkyl group or a long-chain ether group, which may bebranched and may be substituted with a functional group. The long-chainalkyl group, which may be branched and may be substituted with afunctional group, is preferable as the side chain, while the polymerswhose main constituent is (meth)acrylate or polyolefin main chain arepreferable. Examples of the high molecular latent heat storage materialsinclude polymers described in JP-A-2015-091903, WO 2016/098674, and WO2017/217419.

Two or more of the heat storage materials may be used in combination.The heat storage layer may include a sensible heat storage material.Examples of the sensible heat storage material include concrete, crushedstone, iron, copper, steel, and polyethylene.

<Exterior Wall Member>

The exterior wall member is preferably configured such that Ths/(Ta+Tb)is in a range of 0.01 to 0.05.

The exterior wall member may be configured such that the outdoor-sideheat insulating layer (A) and/or the indoor-side heat insulating layer(B) independently includes two or more layers of heat insulating layers.

In such a configuration where the exterior wall member is configuredsuch that the outdoor-side heat insulating layer (A) and/or theindoor-side heat insulating layer (B) independently includes two or morelayers of heat insulating layers, R1 is replaced with R1′ represented byEquation (1′).

$\begin{matrix}{{R\; 1^{\prime}} = {\{ {\sum\limits_{q = 1}^{n}\;( {{Tbq}\text{/}{Kbq}} )} \}\text{/}\{ {{\sum\limits_{p = 1}^{m}\;( {{Tap}\text{/}{Kap}} )} + {\sum\limits_{q = 1}^{n}\;( {{Tbq}\text{/}{Kbq}} )}} \}}} & ( 1^{\prime} )\end{matrix}$

The exterior wall member may include two or more heat storage layers. Insuch a configuration where the exterior wall member includes two or moreheat storage layers, the two or more heat storage layers may includemore than two types of heat storage layers laminated adjacently. In sucha configuration where the exterior wall member includes two or more heatstorage layers, the exterior wall member may include, between the heatstorage layers, a layer other than the heat storage layers.

In the configuration where the exterior wall member includes two or moreheat storage layers, the latent heat amount measurement for working outR2 and R3 is carried out with all the heat storage layers laminated.

The exterior wall member may additionally include a layer other than theoutdoor-side heat insulating layer (A), the heat storage layer, and theindoor-side heat insulating layer (B).

The outdoor-side heat insulating layer (A) and the heat storage layermay be positioned adjacently or not adjacently to each other. The roofmember and the ceiling member may additionally include, between theoutdoor-side heat insulating layer (A) and the heat storage layer, thelayer other than the outdoor-side heat insulating layer (A), the heatstorage layer, and the indoor-side heat insulating layer (B).

The indoor-side heat insulating layer (B) and the heat storage layer maybe positioned adjacently or not adjacently to each other. The roofmember and the ceiling member may additionally include, between theindoor-side heat insulating layer (B) and the heat storage layer, thelayer other than the outdoor-side heat insulating layer (A), the heatstorage layer, and the indoor-side heat insulating layer (B).

Examples of the layer other than the outdoor-side heat insulating layer(A), the heat storage layer, and the indoor-side heat insulating layer(B) include a decorative layer such as wallpaper and flooring, a flameretardant layer such as plasterboard, an exterior wall layer such asmortar, an adhesive layer, an air layer, and the like.

Thicknesses of the outdoor-side heat insulating layer (A) and theindoor-side heat insulating layer (B) in the exterior wall member aresuch that (Ta/Ka+Tb/Kb) is preferably in a range of 0.70 to 1.00, andfurther preferably in a range of 0.80 to 1.00, where (Ta/Ka+Tb/Kb) is aratio of the thicknesses over heat resistance of the exterior wall as awhole. If (Ta/Ka+Tb/Kb), which is the ratio of the thicknesses over theheat resistance of the exterior wall as a whole, is 0.70 or more,influence of the “other layer” in the exterior wall member onto influentand effluent heat amounts into and out of indoor environment would besmall.

The heat resistances of the exterior wall as a whole are worked out byworking out ratios of thicknesses over heat conductivities of therespective layers, and summing the ratios of all the layers.

Examples of production methods for the exterior wall member include:

Multi-layer extrusion molding for forming the outdoor-side heatinsulating layer (A), the heat storage layer, and the indoor-side heatinsulating layer (B) integrally; and

Forming the outdoor-side heat insulating layer (A), the heat storagelayer, and the indoor-side heat insulating layer (B) independently, andintegrating these layers thereafter. In the case of the productionmethod including forming the outdoor-side heat insulating layer (A), theheat storage layer, and the indoor-side heat insulating layer (B)independently, and integrating these layers thereafter, the step ofintegrating may be carried out at a building site in such a way that theheat insulating layers and the heat storage layer are attached with eachother and installed thereafter, or may be carried out in a factory orthe like place, so that the integrated layers are sent to a buildingsite to be installed there.

<Construction>

The exterior wall member can be used to form an exterior wall includingthe exterior wall member. In general, the exterior wall includes theexterior wall member, and a structural member for adding strength. It ispossible to form the exterior wall by laminating the exterior wallmember and the structural member, or by laying the exterior wall memberand the structural member. Examples of materials of the structuralmember include woods, concrete, and metal.

The exterior wall member can be used to form a construction in which theexterior wall member is placed with the outdoor-side heat insulatinglayer (A) disposed on the outdoor side of the construction and with theindoor-side heat insulating layer (B) disposed on the indoor side of theconstruction.

EXAMPLES

In Example 9 and Comparative Example 25, the following properties weremeasured by the following methods.

(1) Thermal Conductivity

Thermal conductivity was measured by the heat flow method according toASTM E1530.

(2) Latent Heat Amount

A value is measured according to JSTM 06101:2018 (which is the standardof Japan Testing Center for Construction Materials) in the followingconditions and analyzed.

A test piece is held between two flat hot plates whose temperature canbe increased or decreased at a constant rate. (1) The hot plates arekept at 60° C. for 5 hours, then (2) cooled from 60° C. to −10° C. at arate of 0.1° C./min, then (3) kept at −10° C. for 5 hours, and then (4)heated from −10° C. to 60° C. at a rate of 0.1° C./min. The apparentspecific heat and latent heat at these temperatures are worked out froma heat flow measured by a heat flow meter at Step (4).

(3) Moisture Permeability Resistance

Moisture permeability resistance was measured at a measuring temperatureof 15° C. by the cup method according to JIS A1324.

(4) Influent Heat Amount and Influent Heat Flux

A heat sensor (heat flow meter) HF-30s made by EKO Instruments B.V. wasplaced on the indoor side of a lamination of a North-side exterior wallof an outdoor experiment building, and measured.

(5) Outdoor-Side Temperature and Indoor-Side Temperature of ExteriorWall

Thermocouple was placed on the indoor side and the outside of thelamination of the North-side exterior wall, and measured.

Example 9

Experiment was carried out in an outdoor experiment building built inNakano city in Nagano prefecture. A lamination (31) including anoutdoor-side heat insulating layer (A31), an indoor-side heat insulatinglayer (B31), and a heat storage layer (C31) between the outdoor-sideheat insulating layer (A31) and the indoor-side heat insulating layer(B31) was used as an exterior wall of the outdoor experiment building.The outdoor experiment building had a total floor area of 3.31 m², and aUA value (Average Overall Heat Transmission coefficient) of 0.45 W/m²/K,and was one-story.

The outdoor-side heat insulating layer (A31) and the indoor-side heatinsulating layer (B31) were three types of extruded polystyrene foamheat-retaining materials (with thickness of 75 mm) defined under JISA9511, respectively. The outdoor-side heat insulating layer (A31) andthe indoor-side heat insulating layer (B31) each have a thermalconductivity of 0.026. Therefore, R1 was 0.5. Furthermore, the heatstorage layer (C31) was such that its latent heat amount was 46300 J/kgin a temperature range of −10° C. to 60° C. and 35300 J/kg in atemperature range of 15° C. to 40° C., L5 was 16300 J/kg, X′ was 20° C.,and L20 was 38700 J/kg. Therefore, R2 was 0.76, R3 was 0.42 and R was0.080 The heat storage layer (C31) was 1.5 mm in thickness and 0.19W/m/K in thermal conductivity.

It should be noted that the heat storage layer was prepared in thefollowing manner. By using a twin-screwed extruder, 80 parts by weightof a copolymer including ethylene-derived structural units,hexadecylacrylate-derived structural units, and methylacrylate-derivedstructural units, 20 parts by weight of polypropylene, an organicperoxide, and a cross-linking auxiliary agent were melted, mixed, andkneaded, thereby obtaining a resin composition thus cross-linked. Theresin composition was shaped in a sheet shape, thereby obtaining theheat storage layer.

The experiment was carried out in such a manner that cooling equipmentinstalled in the outdoor experiment building was set to a settingtemperature of 20° C. and operated continuously for 24 hours, and aninfluent heat amount into indoor environment via a North-side exteriorwall was evaluated on Aug. 22, 2018. FIG. 9 shows outdoor airtemperature, an outdoor-side temperature and an indoor-side temperatureof the exterior wall on Aug. 22, 2018. Influent and effluent heatamounts from the start of the experiment to 24 hours were measured.Results of the experiment are illustrated in FIG. 10 and on Table 1.

Comparative Example 25

Comparative Example 25 was carried out in an outdoor experiment buildinghaving the same shape as that of Example 9 and being built next to thatof Example 9. A lamination (32) including an outdoor-side heatinsulating layer (A32) and an indoor-side heat insulating layer (B32)was used as an exterior wall of the outdoor experiment building. Theoutdoor experiment building had a total floor area of 3.31 m², and a UAvalue (Average Overall Heat Transmission coefficient) of 0.45 W/m²/K,and was one-story.

The outdoor-side heat insulating layer (A32) and the indoor-side heatinsulating layer (B32) were three types of extruded polystyrene foamheat-retaining materials (with thickness of 75 mm) defined under JISA9511, respectively. The outdoor-side heat insulating layer (A32) andthe indoor-side heat insulating layer (B32) each have a thermalconductivity of 0.026 W/m/K. The two sheets of three types of extrudedpolystyrene foam heat-retaining materials were laminated to form theexterior wall. The exterior wall did not include a heat storage layer.

The experiment was carried out in such a manner that cooling equipmentinstalled in the outdoor experiment building was set to a settingtemperature of 20° C. and operated continuously for 24 hours, and aninfluent heat amount into indoor environment via a North-side exteriorwall was evaluated on Aug. 22, 2018. FIG. 9 shows outdoor airtemperature, an outdoor-side temperature and an indoor-side temperatureof the exterior wall on Aug. 22, 2018. Influent and effluent heatamounts from the start of the experiment to 24 hours were measured.Results of the experiment are illustrated in FIG. 10 and on Table 1.

TABLE 1 Influent heat Influent heat amount Influent heat flux reductionInfluent reduction flux at peak ratio compared heat ratio compared[W/m²] with amount with (Time of Comparative [Wh/m²/ Comparative peakExample Day] Example 25 [%] occurrence) 25 [%] Example 9 18.4 10.2 1.9(18:00) 20.8 Comparative 20.5 — 2.4 (17:00) — Example 25

Example 9 attained 10.2% reduction of the influent heat amount withrespect to Comparative Example 25. Furthermore, Example 9 attained 20.8%reduction of the influent heat flux at peak with respect to ComparativeExample 25. These demonstrated that, in a construction in which indoortemperature is kept constant by cooling equipment, the presentdisclosure can facilitate reduction of an influent heat amount, therebyreducing cooling load and attaining high saving energy effect.

Example 10

A resin composition equivalent to the resin composition constituting theheat storage layer of Example 9 was shaped into a sheet of 1 mm inthickness. By passing the sheet through an interstice between a roller Awith quadrangular pyramid protrusions (shape of quadrangular pyramid:quadrangular pyramid with a square base of 2.35 mm×2.35 mm and a heightof 1.64 mm) on its surface, and roller B configured to accept theprotrusions of the roller A, a heat storage layer (C33) having throughholes was prepared. The formation of the through holes was carried outby using the rollers A and B adjusted to a surface temperature of 60° C.Moisture permeability resistance of the heat storage layer (C33) wasmeasured at 15° C. under 90% humidity according to JIS A1324 by the cupmethod. The moisture permeability resistance was 47 m²h·mmHg/g.

A lamination (33) including the outdoor-side heat insulating layer (A31)and the indoor-side heat insulating layer (B31) of Example 9, and theheat storage layer (C33) between the outdoor-side heat insulating layer(A31) and the indoor-side heat insulating layer (B31) was as an exteriorwall of the outdoor experiment building, and an experiment was carriedout under an environment similar to that of Example 9, thereby findingthat influent heat amount observed herein was similar to that observedin Example 9.

Examples 1 to 8 and Comparative Examples 1 to 24 carried outcomputer-based simulation on influent and effluent heat into and out ofindoor environment surrounded by the lamination (exterior wall member)as illustrated in FIG. 1.

The simulation was carried out by using thermal conductivity analysisfeature of LS-DYNA V971 R8.1.0 made by Livermore Software TechnologyCorporation. Time integration was carried out by a full-implicit methodand a matrix computation solver used herein was a symmetric directsolver.

For indoor-side surface temperature of the lamination, indoortemperatures of three levels, namely 24° C., 26° C., and 28° C. wereselected, taking into consideration options that indoor space usersmight select. For outdoor-side surface temperature of the lamination,outdoor air temperatures of a high-temperature day (July 21st), alow-temperature day (September 10th), and an intermediate-temperatureday (August 21st) were selected from the summer time of 2017 inMatsumoto city, Nagano prefecture, thereby setting three levels ofoutdoor-side surface temperatures. The simulation was carried out basedon the three levels of the indoor-side surface temperatures and threelevels of outdoor-side surface temperatures. The three levels ofoutdoor-side surface temperatures are illustrated in FIG. 7.

Note that the simulation was carried out in such a manner that thelamination was kept constantly at 25° C. as a whole at the start ofsimulation, and the properties of the lamination were evaluated bysimulating a heat amount influent into the indoor environment from 24hours to 48 hours.

In addition, a lamination including a layer not having latent heat inthe temperature range of −10° C. to 60° C. instead of the heat storagelayer of the lamination of each Example was also simulated in a similarmanner to work out a heat amount influent into the indoor environment.In each Example, an influent heat amount reduction ratio=100 (Z′−Z)/Z,where Z [Wh/m²/Day] is a heat amount influent into the indoorenvironment in the case where the lamination of that Example was used,and Z′ [Wh/m²/Day] is a heat amount influent into the indoor environmentin the case where the lamination including the layer not having latentheat in the temperature range of −10° C. to 60° C. was used instead ofthe heat storage layer of the lamination of that Example. Furthermore,“influent heat amount reduction points” are defined as follows: if theinfluent heat amount reduction ratio was less than 1%, the point was“0”; if the influent heat amount reduction ratio was not less than 1%but less than 5%, the point was “1”; if the influent heat amountreduction ratio was not less than 5% but less than 10%, the point was“2”; if the influent heat amount reduction ratio was not less than 10%but less than 20%, the point was “3”; and if the influent heat amountreduction ratio was not less than 20%, the point was “4”. Furthermore,“overall properties” are indicated as a sum of an arithmetic mean of theinfluent heat amount reduction points under respective conditions and ageometric mean of the influent heat amount reduction points underrespective conditions. The arithmetic mean of the influent heat amountreduction points also includes high performance observed under aspecific condition and thereby indicates the values of property undervarious usage conditions, whereas the geometric mean of the influentheat amount reduction points indicates the value of property uniformlyobserved under all the condition, thereby being steadily observableunder any outdoor conditions and any indoor conditions.

Example 1

Simulation of a lamination (1) including an outdoor-side heat insulatinglayer (A1), an indoor-side heat insulating layer (B1), and a heatstorage layer (C1) between the outdoor-side heat insulating layer (A1)and the indoor-side heat insulating layer (B1) was carried out. Table 2shows density, sensible heat, and thermal conductivity of each of theoutdoor-side heat insulating layer (A1), the indoor-side heat insulatinglayer (B1), and the heat storage layer (C1). FIG. 3 illustrates apparentspecific heat of a heat storage material 1 constituting the heat storagelayer (C1) of this Example, whereas FIG. 4 illustrates temperaturedistribution of latent heat of the heat storage material 1.

The lamination (1) was configured according to a layer configuration 2shown in Table 3 in terms of thickness Ta of the outdoor-side heatinsulating layer (A1), thickness Tb of the indoor-side heat insulatinglayer (B1), and thickness Ths of the heat storage layer (C1).

An influent heat amount into the indoor environment is shown on Table 5.An influent heat amount reduction ratio is shown on Table 9. An influentheat amount reduction point is shown on Table 13. An overall property isshown on table 16.

Example 2

Simulation was carried out in a similar manner as in Example 1, exceptthat the heat storage material constituting the heat storage layer waschanged to a heat storage material 2. FIG. 4 illustrates temperaturedistribution of latent heat of the heat storage material 2. The heatstorage material 2 was identical with the heat storage material 1 interms of density, sensible heat, and thermal conductivity. Results ofthe simulation are shown on Table 5, Table 9, Table 13, and Table 16.

Example 3

Simulation was carried out in a similar manner as in Example 1, exceptthat the heat storage material constituting the heat storage layer waschanged to a heat storage material 3. FIG. 4 illustrates temperaturedistribution of latent heat of the heat storage material 3. The heatstorage material 3 was identical with the heat storage material 1 interms of density, sensible heat, and thermal conductivity. Results ofthe simulation are shown on Table 5, Table 9, Table 13, and Table 16.

Example 4

Simulation was carried out in a similar manner as in Example 1, exceptthat the heat storage material constituting the heat storage layer waschanged to a heat storage material 4. FIG. 4 illustrates temperaturedistribution of latent heat of the heat storage material 4. The heatstorage material 4 was identical with the heat storage material 1 interms of density, sensible heat, and thermal conductivity. Results ofthe simulation are shown on Table 5, Table 9, Table 13, and Table 16.

Example 5

Simulation was carried out in a similar manner as in Example 1, exceptthat the thickness Ta of the outdoor-side heat insulating layer, thethickness Tb of the indoor-side heat insulating layer, and the thicknessThs of the heat storage layer were changed to those of the layerconfiguration 3 as shown on Table 3. Results of the simulation are shownon Table 6, Table 10, Table 14, and Table 16.

Example 6

Simulation was carried out in a similar manner as in Example 2, exceptthat the thickness Ta of the outdoor-side heat insulating layer, thethickness Tb of the indoor-side heat insulating layer, and the thicknessThs of the heat storage layer were changed to those of the layerconfiguration 3 as shown on Table 3. Results of the simulation are shownon Table 6, Table 10, Table 14, and Table 16.

Example 7

Simulation was carried out in a similar manner as in Example 3, exceptthat the thickness Ta of the outdoor-side heat insulating layer, thethickness Tb of the indoor-side heat insulating layer, and the thicknessThs of the heat storage layer were changed to those of the layerconfiguration 3 as shown on Table 3. Results of the simulation are shownon Table 6, Table 10, Table 14, and Table 16.

Example 8

Simulation was carried out in a similar manner as in Example 4, exceptthat the thickness Ta of the outdoor-side heat insulating layer, thethickness Tb of the indoor-side heat insulating layer, and the thicknessThs of the heat storage layer were changed to those of the layerconfiguration 3 as shown on Table 3. Results of the simulation are shownon Table 6, Table 10, Table 14, and Table 16.

Comparative Example 1

Simulation was carried out in a similar manner as in Example 1, exceptthat the thickness Ta of the outdoor-side heat insulating layer, thethickness Tb of the indoor-side heat insulating layer, and the thicknessThs of the heat storage layer were changed to those of the layerconfiguration 1 as shown on Table 3. Results of the simulation are shownon Table 4, Table 8, Table 12, and Table 16.

Comparative Example 2

Simulation was carried out in a similar manner as in Example 2, exceptthat the thickness Ta of the outdoor-side heat insulating layer, thethickness Tb of the indoor-side heat insulating layer, and the thicknessThs of the heat storage layer were changed to those of the layerconfiguration 1 as shown on Table 3. Results of the simulation are shownon Table 4, Table 8, Table 12, and Table 16.

Comparative Example 3

Simulation was carried out in a similar manner as in Example 3, exceptthat the thickness Ta of the outdoor-side heat insulating layer, thethickness Tb of the indoor-side heat insulating layer, and the thicknessThs of the heat storage layer were changed to those of the layerconfiguration 1 as shown on Table 3. Results of the simulation are shownon Table 4, Table 8, Table 12, and Table 16.

Comparative Example 4

Simulation was carried out in a similar manner as in Example 4, exceptthat the thickness Ta of the outdoor-side heat insulating layer, thethickness Tb of the indoor-side heat insulating layer, and the thicknessThs of the heat storage layer were changed to those of the layerconfiguration 1 as shown on Table 3. Results of the simulation are shownon Table 4, Table 8, Table 12, and Table 16.

Comparative Example 5

Simulation was carried out in a similar manner as in Comparative Example1, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 4 as shown on Table 3. Results of the simulation areshown on Table 7, Table 11, Table 15, and Table 16.

Comparative Example 6

Simulation was carried out in a similar manner as in Comparative Example2, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 4 as shown on Table 3. Results of the simulation areshown on Table 7, Table 11, Table 15, and Table 16.

Comparative Example 7

Simulation was carried out in a similar manner as in Comparative Example3, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 4 as shown on Table 3. Results of the simulation areshown on Table 7, Table 11, Table 15, and Table 16.

Comparative Example 8

Simulation was carried out in a similar manner as in Comparative Example4, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 4 as shown on Table 3. Results of the simulation areshown on Table 7, Table 11, Table 15, and Table 16.

Comparative Example 9

Simulation was carried out in a similar manner as in Example 1, exceptthat the heat storage material constituting the heat storage layer waschanged to a heat storage material 5. FIG. 6 illustrates temperaturedistribution of latent heat of the heat storage material 5. The heatstorage material 5 was identical with the heat storage material 1 interms of density, sensible heat, and thermal conductivity. Results ofthe simulation are shown on Table 18, Table 22, Table 26, and Table 29.

Comparative Example 10

Simulation was carried out in a similar manner as in Example 1, exceptthat the heat storage material constituting the heat storage layer waschanged to a heat storage material 6. FIG. 6 illustrates temperaturedistribution of latent heat of the heat storage material 6. The heatstorage material 6 was identical with the heat storage material 1 interms of density, sensible heat, and thermal conductivity. Results ofthe simulation are shown on Table 18, Table 22, Table 26, and Table 29.

Comparative Example 11

Simulation was carried out in a similar manner as in Example 1, exceptthat the heat storage material constituting the heat storage layer waschanged to a heat storage material 7. FIG. 6 illustrates temperaturedistribution of latent heat of the heat storage material 7. The heatstorage material 7 was identical with the heat storage material 1 interms of density, sensible heat, and thermal conductivity. Results ofthe simulation are shown on Table 18, Table 22, Table 26, and Table 29.

Comparative Example 12

Simulation was carried out in a similar manner as in Example 1, exceptthat the heat storage material constituting the heat storage layer waschanged to a heat storage material 8. FIG. 6 illustrates temperaturedistribution of latent heat of the heat storage material 8. The heatstorage material 8 was identical with the heat storage material 1 interms of density, sensible heat, and thermal conductivity. Results ofthe simulation are shown on Table 18, Table 22, Table 26, and Table 29.

Comparative Example 13

Simulation was carried out in a similar manner as in Comparative Example9, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 3 as shown on Table 3. Results of the simulation areshown on Table 19, Table 23, Table 27, and Table 29.

Comparative Example 14

Simulation was carried out in a similar manner as in Comparative Example10, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 3 as shown on Table 3. Results of the simulation areshown on Table 19, Table 23, Table 27, and Table 29.

Comparative Example 15

Simulation was carried out in a similar manner as in Comparative Example11, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 3 as shown on Table 3. Results of the simulation areshown on Table 19, Table 23, Table 27, and Table 29.

Comparative Example 16

Simulation was carried out in a similar manner as in Comparative Example12, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 3 as shown on Table 3. Results of the simulation areshown on Table 19, Table 23, Table 27, and Table 29.

Comparative Example 17

Simulation was carried out in a similar manner as in Comparative Example13, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 1 as shown on Table 3. Results of the simulation areshown on Table 17, Table 21, Table 25, and Table 29.

Comparative Example 18

Simulation was carried out in a similar manner as in Comparative Example14, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 1 as shown on Table 3. Results of the simulation areshown on Table 17, Table 21, Table 25, and Table 29.

Comparative Example 19

Simulation was carried out in a similar manner as in Comparative Example15, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 1 as shown on Table 3. Results of the simulation areshown on Table 17, Table 21, Table 25, and Table 29.

Comparative Example 20

Simulation was carried out in a similar manner as in Comparative Example16, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 1 as shown on Table 3. Results of the simulation areshown on Table 17, Table 21, Table 25, and Table 29.

Comparative Example 21

Simulation was carried out in a similar manner as in Comparative Example13, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 4 as shown on Table 3. Results of the simulation areshown on Table 20, Table 24, Table 28, and Table 29.

Comparative Example 22

Simulation was carried out in a similar manner as in Comparative Example14, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 4 as shown on Table 3. Results of the simulation areshown on Table 20, Table 24, Table 28, and Table 29.

Comparative Example 23

Simulation was carried out in a similar manner as in Comparative Example15, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 4 as shown on Table 3. Results of the simulation areshown on Table 20, Table 24, Table 28, and Table 29.

Comparative Example 24

Simulation was carried out in a similar manner as in Comparative Example16, except that the thickness Ta of the outdoor-side heat insulatinglayer, the thickness Tb of the indoor-side heat insulating layer, andthe thickness Ths of the heat storage layer were changed to those of thelayer configuration 4 as shown on Table 3. Results of the simulation areshown on Table 20, Table 24, Table 28, and Table 29.

Note that the layer configurations and heat storage materials employedin Examples and Comparative Examples are shown on Table 30.

TABLE 2 Sensible heat Thermal Material Density [kg/m³] [J/(kg · K)]conductivity Heat storage layer (C1) 1000 1950 0.190 Outdoor-side Heatinsulating layer 30.0 1200 0.030 (Ka) (A1) Indoor-side 30.0 1200 0.030(Kb) Heat insulating layer (B1)

TABLE 3 Layer configuration 2 Layer configuration 3 Layer configuration1 (Examples 1 to 4, (Examples 5 to 8, Layer configuration 4 (ComparativeExamples Comparative Examples Comparative Examples (Comparative Examples1 to 4, 17 to 20) 9 to 12) 13 to 16) 5 to 8, 21 to 24) Thickness [mm]Outdoor-side 108 72.0 48.0 12.0 Heat insulating layer (Ta) Heat storage1.5 1.5 1.5 1.5 layer (Ths) Indoor-side 12.0 48.0 72.0 108 Heatinsulating layer (Tb) R1 [−] 0.10 0.40 0.60 0.90

TABLE 4 Influent heat amount of layer configuration 1 [Wh/m²/Day]Comparative Example 1 (heat Indoor storage Comparative Example 2Comparative Example 3 Comparative Example 4 temperature Month & datematerial 1) (heat storage material 2) (heat storage material 3) (heatstorage material 4) 28° C. July 21st 9.3 10.0 10.0 10.3 August 21st 3.44.0 4.0 4.3 September 10th 0.0 0.3 0.3 0.4 26° C. July 21st 16.8 17.017.0 17.1 August 21st 8.9 9.2 9.2 9.2 September 10th 2.5 2.7 2.7 2.9 24°C. July 21st 26.1 26.1 26.1 26.1 August 21st 15.9 15.8 15.8 15.9September 10th 6.7 6.6 6.6 6.7

TABLE 5 Influent heat amount of layer configuration 2 [Wh/m²/Day] IndoorExample 1 (heat Example 2 (heat Example 3 (heat Example 4 (heattemperature Month & date storage material 1) storage material 2) storagematerial 3) storage material 4) 28° C. July 21st 6.6 8.2 8.2 9.2 August21st 1.2 2.4 2.4 3.3 September 10th 0.0 0.0 0.0 0.0 26° C. July 21st15.0 15.8 15.8 16.4 August 21st 6.8 7.6 7.6 8.4 September 10th 1.0 1.31.3 1.9 24° C. July 21st 25.5 25.5 25.5 25.7 August 21st 15.0 14.8 14.815.2 September 10th 5.8 5.2 5.2 5.7

TABLE 6 Influent heat amount of layer configuration 3 [Wh/m²/Day] IndoorExample 5 (heat Example 6 (heat Example 7 (heat Example 8 (heattemperature Month & date storage material 1) storage material 2) storagematerial 3) storage material 4) 28° C. July 21st 6.8 8.3 8.3 9.2 August21st 1.3 2.5 2.5 3.3 September 10th 0.0 0.0 0.0 0.0 26° C. July 21st14.9 15.8 15.8 16.4 August 21st 6.9 7.6 7.6 8.4 September 10th 1.2 1.41.4 1.9 24° C. July 21st 25.4 25.5 25.5 25.5 August 21st 14.9 14.8 14.815.2 September 10th 5.7 5.3 5.3 5.7

TABLE 7 Influent heat amount of layer configuration 4 [Wh/m²/Day]Comparative Example 5 Comparative Example 6 Comparative Example 7Comparative Example 8 Indoor (heat storage material (heat storagematerial (heat storage material (heat storage material temperature Month& date 1) 2) 3) 4) 28° C. July 21st 9.7 10.1 10.1 10.3 August 21st 3.74.1 4.1 4.3 September 10th 0.1 0.4 0.3 0.5 26° C. July 21st 16.9 17.017.0 17.1 August 21st 9.0 9.2 9.2 9.4 September 10th 2.6 2.8 2.8 3.0 24°C. July 21st 26.1 26.1 26.1 26.1 August 21st 15.8 15.8 15.8 15.9September 10th 6.7 6.6 6.6 6.7

TABLE 8 Influent heat amount reduction ratio of Layer configuration 1[%] Comparative Comparative Comparative Comparative Example 1 Example 2Example 3 Example 4 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 1) material 2) material3) material 4) 28° C. July 21st 10.6 3.8 3.8 1.0 August 21st 22.7 9.19.1 2.3 September 10th 100 50.0 50.0 33.3 26° C. July 21st 2.3 1.2 1.20.6 August 21st 6.3 3.2 3.2 3.2 September 10th 19.4 12.9 12.9 6.5 24° C.July 21st 0.4 0.4 0.4 0.4 August 21st 0.6 1.3 1.3 0.6 September 10th 2.94.3 4.3 2.9

TABLE 9 Influent heat amount reduction ratio of Layer configuration 2[%] Example 1 Example 2 Example 3 Example 4 Indoor (heat storage (heatstorage (heat storage (heat storage temperature Month & date material 1)material 2) material 3) material 4) 28° C. July 21st 34.7 18.8 18.8 8.9August 21st 71.4 42.9 42.9 21.4 September 10th 100 100 100 100 26° C.July 21st 11.8 7.1 7.1 3.5 August 21st 26.1 17.4 17.4 8.7 September 10th64.3 53.6 53.6 32.1 24° C. July 21st 1.9 2.0 2.0 1.2 August 21st 4.5 5.75.7 3.2 September 10th 10.8 20.0 20.0 12.3

TABLE 10 Influent heat amount reduction ratio of Layer configuration 3[%] Example 5 Example 6 Example 7 Example 8 Indoor (heat storage (heatstorage (heat storage (heat storage temperature Month & date material 1)material 2) material 3) material 4) 28° C. July 21st 32.7 17.8 17.8 8.9August 21st 69.0 40.5 40.5 21.4 September 10th 100 100 100 100 26° C.July 21st 12.4 7.1 7.1 3.5 August 21st 25.0 17.4 17.4 8.7 September 10th57.1 50.0 50.0 32.1 24° C. July 21st 2.3 1.9 1.9 1.9 August 21st 5.1 5.75.7 3.2 September 10th 12.3 18.5 18.5 12.3

TABLE 11 Influent heat amount reduction ratio of Layer configuration 4[%] Comparative Comparative Comparative Comparative Example 5 Example 6Example 7 Example 8 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 1) material 2) material3) material 4) 28° C. July 21st 6.7 2.9 2.9 1.0 August 21st 15.9 6.8 6.82.3 September 10th 83.3 33.3 50.0 16.7 26° C. July 21st 1.7 1.2 1.2 0.6August 21st 6.3 4.2 4.2 2.1 September 10th 16.1 9.7 9.7 3.2 24° C. July21st 0.4 0.4 0.4 0.4 August 21st 1.3 1.3 1.3 0.6 September 10th 2.9 4.34.3 2.9

TABLE 12 Influent heat amount reduction point of Layer configuration 1[−] Comparative Comparative Comparative Comparative Example 1 Example 2Example 3 Example 4 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 1) material 2) material3) material 4) 28° C. July 21st 3 1 1 1 August 21st 4 2 2 1 September10th 4 4 4 4 26° C. July 21st 1 1 1 0 August 21st 2 1 1 1 September 10th3 3 3 2 24° C. July 21st 0 0 0 0 August 21st 0 1 1 0 September 10th 1 11 1

TABLE 13 Influent heat amount reduction point of Layer configuration 2[−] Example 1 Example 2 Example 3 Example 4 Indoor (heat storage (heatstorage (heat storage (heat storage temperature Month & date material 1)material 2) material 3) material 4) 28° C. July 21st 4 3 3 2 August 21st4 4 4 4 September 10th 4 4 4 4 26° C. July 21st 3 2 2 1 August 21st 4 33 2 September 10th 4 4 4 4 24° C. July 21st 1 1 1 1 August 21st 1 2 2 1September 10th 3 4 4 3

TABLE 14 Influent heat amount reduction point of Layer configuration 3[−] Example 5 Example 6 Example 7 Example 8 Indoor (heat storage (heatstorage (heat storage (heat storage temperature Month & date material 1)material 2) material 3) material 4) 28° C. July 21st 4 3 3 2 August 21st4 4 4 4 September 10th 4 4 4 4 26° C. July 21st 3 2 2 1 August 21st 4 33 2 September 10th 4 4 4 4 24° C. July 21st 1 1 1 1 August 21st 2 2 2 1September 10th 3 3 3 3

TABLE 15 Influent heat amount reduction point of Layer configuration 4[−] Comparative Comparative Comparative Comparative Example 5 Example 6Example 7 Example 8 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 1) material 2) material3) material 4) 28° C. July 21st 2 1 1 1 August 21st 3 2 2 1 September10th 4 4 4 3 26° C. July 21st 1 1 1 0 August 21st 2 1 1 1 September 10th3 2 2 1 24° C. July 21st 0 0 0 0 August 21st 1 1 1 0 September 10th 1 11 1

TABLE 16 Overal property Sum of arithmetic mean and geometric mean ofthe Influent heat amount reduction point [−] Latent heat property Heatstorage Heat storage Heat storage Heat storage of heat storage layermaterial 1 material 2 material 3 material 4 R2 1.0 1.0 0.94 0.84 R3 0.750.44 0.34 0.31 Comparative Comparative Comparative Comparative ThicknessLayer configuration 1 Example 1 Example 2 Example 3 Example 4configuration (0.1) 2.0 1.6 1.6 1.1 of lamination Layer configuration 2Example 1 Example 2 Example 3 Example 4 (R1) (0.4) 5.9 5.8 5.8 4.5 Layerconfiguration 3 Example 5 Example 6 Example 7 Example 8 (0.6) 6.2 5.65.6 4.5 Layer configuration 4 Comparative Comparative ComparativeComparative (0.9) Example 5 Example 6 Example 7 Example 8 1.9 1.4 1.40.9

TABLE 17 Influent heat amount of layer configuration 1 [Wh/m²/Day]Comparative Comparative Comparative Comparative Example 17 Example 18Example 19 Example 20 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 5) material 6) material7) material 8) 28° C. July 21st 10.4 9.3 10.4 10.3 August 21st 4.4 2.14.4 4.3 September 10th 0.6 0.0 0.6 0.5 26° C. July 21st 17.2 17.0 17.217.1 August 21st 9.5 9.2 9.5 9.4 September 10th 3.1 2.8 3.1 3.0 24° C.July 21st 26.2 26.2 26.2 26.1 August 21st 16.0 16.0 16.0 15.9 September10th 6.9 6.9 6.9 6.8

TABLE 18 Influent heat amount of layer configuration 2 [Wh/m²/Day]Comparative Comparative Comparative Comparative Example 9 Example 10Example 11 Example 12 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 5) material 6) material7) material 8) 28° C. July 21st 10.1 4.6 10.1 9.5 August 21st 4.2 0.14.2 3.6 September 10th 0.4 0.0 0.4 0.0 26° C. July 21st 17.0 14.9 17.016.6 August 21st 9.2 7.4 9.2 8.7 September 10th 2.8 1.9 2.8 2.2 24° C.July 21st 26.0 26.0 26.0 25.8 August 21st 15.7 15.7 15.7 15.3 September10th 6.5 6.5 6.5 5.9

TABLE 19 Influent heat amount of layer configuration 3 [Wh/m²/Day]Comparative Comparative Comparative Comparative Example 13 Example 14Example 15 Example 16 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 5) material 6) material7) material 8) 28° C. July 21st 10.1 5.0 10.1 9.5 August 21st 4.2 0.54.2 3.6 September 10th 0.4 0.0 0.4 0.0 26° C. July 21st 17.0 14.5 17.016.6 August 21st 9.2 7.2 9.2 8.7 September 10th 2.8 1.8 2.8 2.2 24° C.July 21st 26.0 25.8 26.0 25.8 August 21st 15.7 15.5 15.7 15.3 September10th 6.5 6.4 6.5 5.9

TABLE 20 Influent heat amount of layer configuration 4 [Wh/m²/Day]Comparative Comparative Comparative Comparative Example 21 Example 22Example 23 Example 24 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 5) material 6) material7) material 8) 28° C. July 21st 10.4 9.2 10.4 10.3 August 21st 4.4 3.24.4 4.3 September 10th 0.6 0.0 0.6 0.5 26° C. July 21st 17.2 16.9 17.217.1 August 21st 9.6 8.8 9.6 9.4 September 10th 3.1 2.7 3.1 3.0 24° C.July 21st 26.2 26.2 26.2 26.1 August 21st 16.0 15.9 16.0 15.9 September10th 6.9 6.8 6.9 6.8

TABLE 21 Influent heat amount reduction ratio of Layer configuration 1[%] Comparative Comparative Comparative Comparative Example 17 Example18 Example 19 Example 20 Indoor (heat storage (heat storage (heatstorage (heat storage temperature Month & date material 5) material 6)material 7) material 8) 28° C. July 21st 0.0 10.6 0.0 1.0 August 21st0.0 52.3 0.0 2.3 September 10th 0.0 100 0 16.7 26° C. July 21st 0.0 1.20.0 0.6 August 21st 0.0 3.2 0.0 1.1 September 10th 0.0 9.7 0.0 3.2 24°C. July 21st 0.0 0.0 0.0 0.4 August 21st 0.0 0.0 0.0 0.6 September 10th0.0 0.0 0.0 1.4

TABLE 22 Influent heat amount reduction ratio of Layer configuration 2[%] Comparative Comparative Comparative Comparative Example 9 Example 10Example 11 Example 12 Indoor (heat storage (heat storage (heat storage(heat storage temperature Month & date material 5) material 6) material7) material 8) 28° C. July 21st 0.0 54.5 0.0 5.9 August 21st 0.0 97.60.0 14.3 September 10th 0.0 100 0.0 100 26° C. July 21st 0.0 12.4 0.02.4 August 21st 0.0 19.6 0.0 5.4 September 10th 0.0 32.1 0.0 21.4 24° C.July 21st 0.0 0.0 0.0 0.8 August 21st 0.0 0.0 0.0 2.5 September 10th 0.00.0 0.0 9.2

TABLE 23 Influent heat amount reduction ratio of Layer configuration 3[%] Comparative Example 13 Comparative Example 14 Comparative Example 15Comparative Example 16 Indoor (heat storage material (heat storagematerial (heat storage material (heat storage material temperature Month& date 5) 6) 7) 8) 28° C. July 21st 0.0 50.5 0.0 5.9 August 21st 0.088.1 0.0 14.3 September 10th 0.0 100 0.0 100 26° C. July 21st 0.0 14.70.0 2.4 August 21st 0.0 21.7 0.0 5.4 September 10th 0.0 35.7 0.0 21.424° C. July 21st 0.0 0.8 0.0 0.8 August 21st 0.0 1.3 0.0 2.5 September10th 0.0 1.5 0.0 9.2

TABLE 24 Influent heat amount reduction ratio of Layer configuration 4[%] Comparative Example Comparative Example Comparative ExampleComparative Example 24 Indoor 21 (heat storage 22 (heat storage 23 (heatstorage (heat storage material temperature Month & date material 5)material 6) material 7) 8) 28° C. July 21st 0.0 11.5 0.0 1.0 August 21st0.0 27.3 0.0 2.3 September 10th 0.0 100 0.0 16.7 26° C. July 21st 0.01.7 0.0 0.6 August 21st 0.0 8.3 0.0 2.1 September 10th 0.0 12.9 0.0 3.224° C. July 21st 0.0 0.0 0.0 0.4 August 21st 0.0 0.6 0.0 0.6 September10th 0.0 1.4 0.0 1.4

TABLE 25 Influent heat amount reduction point of Layer configuration 1[−] Comparative Example 17 Comparative Example 18 Comparative Example 19Comparative Example 20 Indoor (heat storage material (heat storagematerial (heat storage material (heat storage material temperature Month& date 5) 6) 7) 8) 28° C. July 21st 0 3 0 1 August 21st 0 4 0 1September 10th 0 4 0 3 26° C. July 21st 0 1 0 0 August 21st 0 1 0 1September 10th 0 2 0 1 24° C. July 21st 0 0 0 0 August 21st 0 0 0 0September 10th 0 0 0 1

TABLE 26 Influent heat amount reduction point of Layer configuration 2[−] Comparative Example 9 Comparative Example 10 Comparative Example 11Comparative Example 12 Indoor (heat storage material (heat storagematerial (heat storage material (heat storage material temperature Month& date 5) 6) 7) 8) 28° C. July 21st 0 4 0 2 August 21st 0 4 0 3September 10th 0 4 0 4 26° C. July 21st 0 3 0 1 August 21st 0 3 0 2September 10th 0 4 0 4 24° C. July 21st 0 0 0 0 August 21st 0 0 0 1September 10th 0 0 0 2

TABLE 27 Influent heat amount reduction point of Layer configuration 3[−] Comparative Example 13 Comparative Example 14 Comparative Example 15Comparative Example 16 Indoor (heat storage material (heat storagematerial (heat storage material (heat storage material temperature Month& date 5) 6) 7) 8) 28° C. July 21st 0 4 0 2 August 21st 0 4 0 3September 10th 0 4 0 4 26° C. July 21st 0 3 0 1 August 21st 0 4 0 2September 10th 0 4 0 4 24° C. July 21st 0 0 0 0 August 21st 0 1 0 1September 10th 0 1 0 2

TABLE 28 Influent heat amount reduction point of Layer configuration 4[−] Comparative Example 21 Comparative Example 22 Comparative Example 23Comparative Example 24 Indoor (heat storage material (heat storagematerial (heat storage material (heat storage material temperature Month& date 5) 6) 7) 8) 28° C. July 21st 0 3 0 1 August 21st 0 4 0 1September 10th 0 4 0 3 26° C. July 21st 0 1 0 0 August 21st 0 2 0 1September 10th 0 3 0 1 24° C. July 21st 0 0 0 0 August 21st 0 0 0 0September 10th 0 1 0 1

TABLE 29 Sum of arithmetic mean and geometric mean of the influent heatamount reduction point [−] Heat storage Heat storage Heat storage Heatstorage Latent heat property of heat storage layer material 5 material 6material 7 material 8 R2 0.0 1.0 0.0 0.65 R3 1.0 1.0 1.0 0.29 ThicknessLayer configuration 1 Comparative Comparative Comparative Comparativeconfiguration (0.1) Example 17 Example 18 Example 19 Example 20 oflamination 0.0 1.7 0.0 0.9 (R1) Layer configuration 2 ComparativeComparative Comparative Comparative (0.4) Example 9 Example 10 Example11 Example 12 0.0 2.4 0.0 2.1 Layer configuration 3 ComparativeComparative Comparative Comparative (0.6) Example 13 Example 14 Example15 Example 16 0.0 2.8 0.0 2.1 Layer configuration 4 ComparativeComparative Comparative Comparative (0 9) Example 21 Example 22 Example23 Example 24 0.0 2.0 0.0 0.9

TABLE 30 Layer Layer Layer Layer configuration 1 configuration 2configuration 3 configuration 4 Heat storage material R1 = 0.10 R1 =0.40 R1 = 0.60 R1 = 0.90 Heat storage material 1 R2 = 1.0 R3 = 0.75Comparative Example 1 Example 5 Comparative Example 1 Example 5 Heatstorage material 2 R2 = 1.0 R3 = 0.44 Comparative Example 2 Example 6Comparative Example 2 Example 6 Heat storage material 3 R2 = 0.94 R3 =0.34 Comparative Example 3 Example 7 Comparative Example 3 Example 7Heat storage material 4 R2 = 0.84 R3 = 0.31 Comparative Example 4Example 8 Comparative Example 4 Example 8 Heat storage material 5 R2 =0.0 R3 = 1.0 Comparative Comparative Comparative Comparative Example 17Example 9 Example 13 Example 21 Heat storage material 6 R2 = 1.0 R3 =1.0 Comparative Comparative Comparative Comparative Example 18 Example10 Example 14 Example 22 Heat storage material 7 R2 = 0.0 R3 = 1.0Comparative Comparative Comparative Comparative Example 19 Example 11Example 15 Example 23 Heat storage material 8 R2 = 0.65 R3 = 0.29Comparative Comparative Comparative Comparative Example 20 Example 12Example 16 Example 24

TABLE 31 Example 1 Example 2 Example 3 Example 4 R1 [−] 0.40 0.40 0.400.40 R2 [−] 1.0 1.0 0.94 0.84 R3 [−] 0.75 0.44 0.34 0.31 X′ [° C.] 28 2828 28 L5 [kJ/kg] 45 26 18 14 L20 [kJ/kg] 60 60 53 45 R [−] 0.060 0.0320.068 0.103

TABLE 32 Example 5 Example 6 Example 7 Example 8 R1 [−] 0.60 0.60 0.600.60 R2 [−] 1.0 1.0 0.94 0.84 R3 [−] 0.75 0.44 0.34 0.31 X′ [° C.] 28 2828 28 L5 [kJ/kg] 45 26 18 14 L20 [kJ/kg] 60 60 53 45 R [−] 0.060 0.0320.068 0.103

TABLE 33 Comparative Comparative Comparative Comparative Example 1Example 2 Example 3 Example 4 R1 [−] 0.10 0.10 0.10 0.10 R2 [−] 1.0 1.00.94 0.84 R3 [−] 0.75 0.44 0.34 0.31 X′ [° C.] 28 28 28 28 L5 [kJ/kg] 4526 18 14 L20 [kJ/kg] 60 60 53 45 R [−] 0.360 0.332 0.368 0.403

TABLE 34 Comparative Comparative Comparative Comparative Example 5Example 6 Example 7 Example 8 R1 [−] 0.90 0.90 0.90 0.90 R2 [−] 1.0 1.00.94 0.84 R3 [−] 0.75 0.44 0.34 0.31 X′ [° C.] 28 28 28 28 L5 [kJ/kg] 4526 18 14 L20 [kJ/kg] 60 60 53 45 R [−] 0.360 0.332 0.368 0.403

TABLE 35 Comparative Comparative Comparative Comparative Example 9Example 10 Example 11 Example 12 R1 [−] 0.40 0.40 0.40 0.40 R2 [−] 0.01.0 0.0 0.65 R3 [−] 1.0 1.0 1.0 0.29 X′ [° C.] 10 28 45 28 L5 [kJ/kg] 6060 60 10 L20 [kJ/kg] 60 60 60 33 R [−] 1.223 0.223 1.223 0.210

TABLE 36 Comparative Comparative Comparative Comparative Example 13Example 14 Example 15 Example 16 R1 [−] 0.60 0.60 0.60 0.60 R2 [−] 0.01.0 0.0 0.65 R3 [−] 1.0 1.0 1.0 0.29 X′ [° C.] 10 28 45 28 L5 [kJ/kg] 6060 60 10 L20 [kJ/kg] 60 60 60 33 R [−] 1.223 0.223 1.223 0.210

TABLE 37 Comparative Comparative Comparative Comparative Example 17Example 18 Example 19 Example 20 R1 [−] 0.10 0.10 0.10 0.10 R2 [−] 0.01.0 0.0 0.65 R3 [−] 1.0 1.0 1.0 0.29 X′ [° C.] 10 28 45 28 L5 [kJ/kg] 6060 60 10 L20 [kJ/kg] 60 60 60 33 R [−] 1.523 0.523 1.523 0.510

TABLE 38 Comparative Comparative Comparative Comparative Example 21Example 22 Example 23 Example 24 R1 [−] 0.90 0.90 0.90 0.90 R2 [−] 0.01.0 0.0 0.65 R3 [−] 1.0 1.0 1.0 0.29 X′ [° C.] 10 28 45 28 L5 [kJ/kg] 6060 60 10 L20 [kJ/kg] 60 60 60 33 R [−] 1.523 0.523 1.523 0.510

FIG. 8 is a graph on which the results of Examples 1 to 8 andComparative Examples 1 to 24 are plotted where the horizontal axisindicates parameter R and the vertical axis indicates the sum of thearithmetic mean and geometric mean of the influent heat amount reductionpoints (overall property). The laminations of Examples 1 to 8 andComparative Examples 1 to 24 were identical with each other in terms oftotal thickness. When the laminations of Examples 1 to 8 with parameterR of 0.20 or less are used, it would become possible to facilitatereduction of the influent heat amount into indoor environment,regardless of various outdoor air temperature conditions and indoorsetting temperatures.

What is claimed is:
 1. An exterior wall member, comprising: anoutdoor-side heat insulating layer (A); an indoor-side heat insulatinglayer (B); and a heat storage layer between the outdoor-side heatinsulating layer (A) and the indoor-side heat insulating layer (B),wherein R<0.20 where R is represented by Equation 3:R=2(R1−0.5)²+(R2−1)²+(R3−0.55)² where R1 is represented by Equation 1:R1=(Tb/Kb)/(Ta/Ka+Tb/Kb), where Ka is a thermal conductivity of theoutdoor-side heat insulating layer (A), Ta is a thickness of theoutdoor-side heat insulating layer (A), Kb is a thermal conductivity ofthe indoor-side heat insulating layer (B), and Tb is a thickness of theindoor-side heat insulating layer (B), R2 is a ratio of a latent heatamount of the heat storage layer in a temperature range of 15° C. to 40°C. with respect to a latent heat amount of the heat storage layer in atemperature range of −10° C. to 60° C., and R3 is represented byEquation 2:R3=L5/L20, where L5 is a latent heat amount of the heat storage layer ina temperature range X, and L20 is a latent heat amount of the heatstorage layer in a temperature range of (X′−10)° C. inclusive to(X′+10)° C. inclusive, X is a 5° C.-width temperature range in which thelatent heat amount of the heat storage layer is the largest among latentheat amounts of given 5° C.-width temperature ranges within thetemperature range of −10° C. to 60° C., and X′ is a center temperatureof the temperature range X.
 2. The exterior wall member according toclaim 1, wherein R1 is not less than 0.30 but not more than 0.70, R2 isnot less than 0.70 but not more than 1.00, and R3 is not less than 0.30but not more than 0.80.
 3. The exterior wall member according to claim1, wherein at least one layer selected from the group consisting of theoutdoor-side heat insulating layer (A) and the indoor-side heatinsulating layer (B) is a layer comprising a polystyrene foam, a rigidpolyurethane foam or a phenol resin foam having a thermal conductivityof 0.03 W/(mK) or less.
 4. The exterior wall member according to claim1, wherein X′ is not less than 15° C. but not more than 40° C.
 5. Theexterior wall member according to claim 1, wherein the heat storagelayer has a moisture permeability resistance of 900 m²h·mmHg/g or less.6. A construction comprising: the exterior wall member according claim1, wherein the outdoor-side heat insulating layer (A) included in theexterior wall member is disposed on an outdoor side of the constructionand the indoor-side heat insulating layer (B) is disposed on an indoorside of the construction.
 7. An exterior wall comprising the exteriorwall member according to claim 1.